For now, the orphan purger backs off when the parent entity is invalid (eg. NULL) as even if in many cases it means that the entity is indeed orphan, it could also mean that the parent reference is not set although a reference exists through one of the defined ERR field.
If isValidParent() return PARENT_INVALID_SKIP, try to find an entity referencing this entity through any defined ERR field that target this entity type.
Review & test.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Just ran into the need for this. Added an explicit access check, which is required in Drupal 10. Patch appears to work.